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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364.9600 FAX(415) 364-9233 <br /> 404 N. Wiget Lane Walnut Creek, CA 94598 (510) 988.9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0I00 <br /> Pacific Environmental Group, Inc. Cli'e'iif Prbjectlb:' Arco'4M, Lodi,CA <br /> 11315 Sunrise Gold Circle, #M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /> Attention: Greg Barclay QC Sample Group 6090273-84 Reported: Sep 23, 19 <br /> is <br /> 01 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: B.Williams S.Williams B.Williams B.Williams <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS091796 LCS091796 LCS091796 LCS091796 <br /> Date Prepared: 09/17/96 09/17/96 09/17/96 09/17/96 <br /> Date Analyzed: 09/17/96 09/17/96 09/17/96 09/17/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery: 93 97 98 99 <br /> Control Limits; 70-130 70-130 70-130 70-130 <br /> .... .............. <br /> ............ <br /> MS/MSD <br /> Batch #: 6090133 6090133 6090133 6090133 <br /> Date Prepared: 09/17/96 09/17/96 09/17/96 09/17/96 <br /> Date Analyzed: 09/17/96 09/17/96 09/17/96 09/17/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GGHP-) <br /> Matrix Spike <br /> %Recovery: 94 97 96 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 93 99 96 99 <br /> Relative % <br /> Difference: 1.1 2.0 0.0 1.0 <br /> SEQUOIA ANALYTICAL Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> validation of sample batch results. Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C. SchCn/ider and are not used to accept or reject batch results. <br /> ct —FV- <br /> 7Piro"lipect Manager/Sacramento Labors To <br /> 6090273.PES <5> <br />